Mojo: Mojom: Use super() in the AST code.

Mojo: Mojom: Use super() in the AST code.

The python 2.x super() is super annoying, but using it is (arguably)
slightly less fragile than just calling the superclass's methods
directly.

Also, make the various __eq__()s call their super's __eq__() (except for
NodeBase).

R=davemoore@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=283191

[DaveMoore, 2014-07-15 00:19:44]

lgtm

[viettrungluu, 2014-07-15 01:19:26]

The CQ bit was checked by viettrungluu@chromium.org

[commit-bot: I haz the power, 2014-07-15 01:20:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/viettrungluu@chromium.org/393593002/1

[commit-bot: I haz the power, 2014-07-15 07:22:50]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_aosp on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_aosp/builds/9...)
  linux_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu/builds/...)
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/28597)
  win_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/33015)

[commit-bot: I haz the power, 2014-07-15 07:24:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-15 07:24:39]

Try jobs failed on following builders:
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/28660)

[viettrungluu, 2014-07-15 15:31:08]

Committed patchset #2 manually as r283191 (presubmit successful).